[Bug 33222] New: random hang-up with nouveau when browsing with Google chrome

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           Summary: random hang-up with nouveau when browsing with Google
           Product: xorg
           Version: git
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: zhangchi866 at gmail.com
         QAContact: xorg-team at lists.x.org

Created an attachment (id=42141)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=42141)
Xorg's log file when the screen is locked up

Machine: Acer AS4741G Laptop, GeForce GT330M
OS: Ubuntu 10.10 with kernel 2.6.35-24-generic ppa kernel 2.6.37-12-generic

  While nVidia's official driver does not work on this machine with Ubuntu
10.10 at all(kernel module crashes when Xorg starts), nouveau has been working
quite well during the most of the time. However, my screen gets locked up
sometimes, while the mouse can still move(I guess that's because of the KMS?).
Eventually I noticed most of the hang-ups occur when I am browsing with Google
  If I simply press SysRq + E, nothing interesting will happen. However, if I
press Alt + F1 then Ctrl + Alt + Delete, I can get my terminal output back,
with mouse pointer still on it(and still be able to move). When the system is
rebooting, I noticed some interesting output generated by nouveau kernel
module, unfortunately I failed to capture it. It was about freeing pipes or
something like that.

How to reproduce:
  Open Google Chrome and do some browsing. Sometimes it will occur.

Some related kernel log:
[ 3898.187413] lo: Disabled Privacy Extensions
[ 4678.979112] SysRq : Emergency Sync
[ 4680.136259] Emergency Sync complete
[ 4682.051498] SysRq : Emergency Sync
[ 4682.182746] Emergency Sync complete
[ 4700.331310] SysRq : Emergency Sync
[ 4700.810373] SysRq : Terminate All Tasks
[ 4700.896122] [drm] nouveau 0000:02:00.0: nouveau_channel_free: freeing fifo 4
[ 4703.168838] Emergency Sync complete
[ 4703.192146] udev[6756]: starting version 163
[ 4706.996895] SysRq : Keyboard mode set to system default
[ 4709.226534] SysRq : Emergency Sync
[ 4709.380392] Emergency Sync complete
[ 4720.799825] SysRq : Emergency Sync
[ 4721.060145] SysRq : Emergency Sync
[ 4721.238953] SysRq : Emergency Sync
[ 4721.469322] Emergency Sync complete
[ 4721.536215] Emergency Sync complete
[ 4722.294752] Emergency Sync complete
[ 4723.461188] SysRq : Emergency Remount R/O
(I am so silly that I pressed SysRq + U, otherwise something useful will get

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